The effect of dazomet and fosetyl-Aluminium on indigenous and introduced arbuscular mycorrhizal fungi in commercial strawberry production |
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Authors: | Mark GL Cassells AC |
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Institution: | (1) Department of Plant Science, National University of Ireland, Cork, Ireland |
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Abstract: | Field and outdoor pot trials were conducted to assess the compatibility of an introduced arbuscular mycorrhizal fungal (AMF)
isolate Glomus fistulosum (Skou and Jakobsen sp. nov.] BEG 31) and indigenous AMF isolate/s, with biocides frequently used
in commercial strawberry production, namely dazomet and fosetyl-Al (fosetyl aluminium). In the field trial, ‘Elsanta’ plants
did not exhibit any mycorrhizal colonisation by indigenous AMF spp. after soil fumigation with dazomet. Recolonisation by
indigenous AMF was low one year after soil fumigation and was possibly as a result of viable indigenous AMF propagules being
washed in from adjacent non-fumigated fields. The degree of colonisation by the introduced AMF isolate G. fistulosum decreased
by approximately 1/2 of its original value after one year in the field. Despite fosetyl-Al application Phytophthora fragariae
Hickman infection was still prevalent in ‘Elsanta’ during the trial. Although fosetyl-Al did not significantly affect mycorrhizal
colonisation, % total G. fistulosum root length colonisation and the proportion of it that was arbuscular, significantly decreased
with increased sampling time. In the pot trial, foliar applications of fosetyl-Al significantly reduced the percentage of
AMF colonisation that was vesicular and this was independent of the number of spray applications. Fosetyl-Al did not significantly
influence the metabolic activity of G. fistulosum colonisation.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | arbuscular mycorrhizal fungi dazomet fosetyl-Al soil fumigation strawberry succinate dehydrogenase activity |
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